Quantcast Waveform Checks of A5Al, A4A1, A2, A3, A4 and A5 Component Assemblies and Modules

 

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Figure 3-1. Initial Test Setup.
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TM-11-6125-259-30 Inverter Power Static PP-7274C/A Manual
Next
Figure 3-4. Major Bridge Drive Signal.
TM 11-6125-259-30
between 393 and 407 Hz.
component assemblies and modules. See figures
h. Connect the oscilloscope and counter to pins
3-11 through 3-16, as applicable, for location of
13(+) and 15(-) of Component assembly A6. The
referenced pins.
observed waveform shall be as shown in figure 3-3
WARNING
and the counter shall indicate a frequency between
High Voltage and currents are present
393 and 407 Hz.
on disassembled inverter when it is
i. Connect the oscilloscope to pins 11(+) and 8(-),
energized. Do not touch any exposed
pins 10(+) and 9(-) or 18(+) and 19(-) of com-
wiring or any metal point within the
ponent assembly A6. The observed waveform shall
inverter. Lethal shock could result.
be as shown in figure 3-3.
a. Remove top cover in accordance with para
j. Connect the oscilloscope to pins 15(+) and 7(­)
of component assembly A6. The observed waveform
h. Disconnect wire at pin 13 of component
shall be as shown in figure 3-2, except the am-
assembly A5A1 and connect a 30 vdc power supply
plitude shall be approximately 5 volts.
to pins 12(+) and 14(­) of component assembly
A5A1. Adjust power supply voltage to 25.0 ±2.O
(1) Set ŘA switches, S1, S2, S3 and S4 to up (on)
vdc.
position.
C. Connect Oscilloscope AN/USM-281 to pins 10
(2) Set ŘA switch S5 to up (200% OL) position
and 11, 12 and 13 and 14 and 15 of component
and observe that above waveform goes to 0 volts in
assembly A4A1. At each connection the observed
5 to 15 seconds. Observe that within 1 to 1.5
waveform shall be as shown in figure 3-4.
seconds after waveform goes to 0 volts, it returns to
d. Connect the oscilloscope to pins 16 and 17, 18
normal and then cycles off and on at about a one-
and 19 and 20 and 21 of component assembly A4A1.
second rate.
At each connection the observed waveform shall be
(3) Set ŘA switches Sl and S5 to down position.
as shown in figure 3-5.
k. Connect the oscilloscope to pins ll(+) and 7(-)
e. Connect the oscilloscope to pin 4 and Q207-E
of component assembly A6. The observed waveform
of module A2. The observed waveform shall be as
shall be as shown in figure 3-3, except the am-
shown in figure 3-6.
plitude shall be approximately 5 volts.
f. Connect the oscilloscope to pin 4 and Q307-E of
(1) Set ŘA switch S10 to up (SHORT) position
module A3. The observed waveform shall be as
and observe that above waveform shall convert to a
shown in figure 3-6.
square wave with a frequency between 393 and 407
g. Connect a 40 vdc, 5 amperes power supply to
Hz.
pins l(­) and 5(+) of module A4. Adjust power
(2) Set ŘA switch S10 to down position and
supply voltage to 10.0 ­0.5 vdc.
observe that waveform drops to 0 volts and returns
h. Connect the oscilloscope to pins 1 and 2, 4 and
to level of figure 3-3.
7 and 8 and 9 of component assembly A4A1. At
l. Set UNIT PWR switch S6 to down position.
each connection the observed waveform shall be as
Connect the oscilloscope to pins 15(+) and 7(­) of
shown in figure 3-7.
assembly A6. Set UNIT PWR switch S6 to up (ON)
i. Connect the oscilloscope to pins 22 and 23, 25
position and observe that waveform shall be 0 volts
and 28 and 29 and 30 of component assembly A4A1.
for approximately 1 second before displaying a 400
At each connection the observed waveform shall be
Hz square wave.
as shown in figure 3-8.
m. Set UNIT PWR switch S6 to down position.
j. Increase 40 vdc power supply voltge to 37.0
Disconnect inverter from test fixture.
±0.5 vdc and repeat i above. The observed
n. If required at this time, carefully lay A7
waveform shall be as shown in figure 3-8 except the
component assembly (17) back in place on top of A6
peak-to-peak voltage shall be approximately 74 vdc.
assembly (16); be careful of interconnecting wiring.
k. Increase 40 vdc power supply voltage to 39.0
Install A7 assembly with six screws (20), six
±0.5 vdc. Using a X10 probe, connect oscilloscope
lockwashers (21) and six flat washers (22).
to pins 22 and 25, 23 and 26, and 24 and 27 of
o. Reassemble bottom cover in accordance with
module A5. The observed waveform shall be as
para 3-10 m, if required at this time.
shown in figure 3-9.
3-3. Waveform Checks of A5Al, A4A1, A2, A3,
l. Turn off and disconnect 40 vdc power supply.
A4 and A5 Component Assemblies and
Reduce the 28 vdc input voltage to 0. Turn off and
Modules
disconnect the 30 vdc power supply.
m. Solder wire back to pin 13 of component
The instructions in this paragraph are performed
assembly A5A1.
only if internal inverter waveforms are required to
n. Reassemble top cover in accordance with para
be checked on A5A1, A4A1, A2, A3, A4 and A5
3-10 n.
3-3

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